Micron Stock Gains Despite Samsung HBM3e Production

Samsung Electronics began mass production and commercial shipments of HBM4 high-bandwidth memory chips this month, a move that positions the company to gain ground in the artificial intelligence chip market, even as Micron Technology’s future in the segment faces uncertainty.

The Korean chipmaker will supply HBM4 chips to Nvidia for its upcoming Vera Rubin AI accelerators, according to reports from Yonhap News Agency. Samsung’s stock climbed nearly 5% on Monday following the announcement. SK Hynix, another major South Korean memory chip manufacturer, similarly saw its shares rise, increasing by 5.72%.

Micron, yet, is facing challenges in validating its HBM4 production, with some analysts projecting a potential loss of Nvidia orders for the Rubin lineup. SemiAnalysis reported that Nvidia is not currently ordering HBM from Micron. Despite these concerns, Micron’s stock still rose over 3% as analysts anticipate the company will maintain a 20-25% share of the overall HBM market. Micron plans to begin HBM4 production in the second quarter of 2026, placing it roughly one quarter behind Samsung’s schedule.

The HBM market is currently led by SK Hynix with a 62% share, followed by Micron at 21% and Samsung at 17%, according to Counterpoint Research. Analysts expect Samsung’s position to strengthen as HBM4 enters full-scale supply this year. SemiAnalysis projects SK Hynix will capture 70% of the HBM4 market, with Samsung taking the remaining 30%.

The shift in momentum comes as major chip manufacturers increasingly focus on integrating HBM4, which combines logic and memory into a single package to deliver higher performance. AI chip makers are adopting three-supplier strategies, creating space for Samsung, SK Hynix, and Micron, even as the competitive landscape intensifies.